氮气阻化细水雾雾化特性研究

发布时间：2019-02-27 20:38

【摘要】：汽雾阻化是使阻化液雾化后进入采空区阻止煤氧化、防止采空区煤炭自然发火的技术。针对现有雾化技术喷嘴易堵塞、动力不足及雾化量有限的缺点和不足,构建新型雾化实验系统,通过理论和实验分析,对雾化参数进行研究。结果表明:(1)气体流量和气体压力,水流量和水压基本为线性关系,且不同初始设定压力下变化趋势相似;(2)不同初始压力下,细水雾的粒径随气体流量的增大而减小,细水雾的粒径随气体压力、水流量和水压的增大而增大;(3)在初始压力P一定条件下,雾化装置存在雾化的临界气压和水压,当水流量水压很小时,水压不足以克服喉管处气体压力进入雾化装置雾化,细水雾产雾量为0的压力值并非其临界压力,氮气阻化细水雾临界水压要高于正常产雾情况下的最低水压。本文研究成果将丰富细水雾防灭火方面的理论和实验研究,推动氮气阻化细水雾在煤矿防灭火领域的应用。
[Abstract]:Vapor mist inhibition is a technique to prevent coal oxidation and spontaneous combustion of coal in goaf after atomization of blocking liquid into mined-out area, which can prevent coal oxidation in goaf and prevent spontaneous combustion of coal in goaf. Aiming at the shortcomings and shortcomings of the nozzles in the present atomization technology, such as clogging, insufficient power and limited amount of atomization, a new experimental system of atomization is constructed, and the atomization parameters are studied by theoretical and experimental analysis. The results show that: (1) the gas flow rate and the gas pressure, the water flow rate and the water pressure are basically linear, and the change trend is similar under different initial set pressures; (2) at different initial pressures, the particle size of water mist decreases with the increase of gas flow rate, and the particle size of water mist increases with the increase of gas pressure, water flow rate and water pressure; (3) under the condition of the initial pressure P, the critical pressure and pressure of atomization exist in the atomization device. When the water flow pressure is very small, the water pressure is not enough to overcome the gas pressure at the throat to enter the atomization device. The pressure of water mist is not its critical pressure, and the critical water pressure of water mist is higher than that of normal fog-producing condition. The research results in this paper will enrich the theoretical and experimental research on water mist prevention and fire suppression, and promote the application of nitrogen suppression water mist in the field of coal mine fire prevention and extinguishing.
【作者单位】：中国矿业大学安全工程学院;中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;
【基金】：国家自然科学基金项目资助(编号:51374202)
【分类号】：TD752.2

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